<#include "/include/parameters.ftl">
<#if hasKaptcha!="true">
<@pp.dropOutputFile />
</#if>
<#if noCopyright!="true">
<#include "/include/copyright-star.ftl">
</#if>
package ${pkgName}.controller;

import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

//import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Controller
public class KaptchaController {

    @Autowired
    private Producer captchaProducer;

    //@GetMapping("/getKaptchaImage")
    @RequestMapping(value="/getKaptchaImage")
    public void getKaptchaImage(HttpServletResponse response, HttpServletRequest request) throws Exception {

        response.setDateHeader("Expires", 0);

        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");

        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");

        // Set standard HTTP/1.0 no-cache header.
        response.setHeader("Pragma", "no-cache");

        // return a jpeg
        response.setContentType("image/jpeg");

        // create the text for the image
        String capText = captchaProducer.createText();

        //将验证码存到session
        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

        // create the image with the text
        BufferedImage bi = captchaProducer.createImage(capText);

        ServletOutputStream out = response.getOutputStream();

        // write the data out
        ImageIO.write(bi, "jpg", out);

        try {
            out.flush();
        } finally {
            out.close();
        }
    }
}
